Activity of the Tobacco Industry in Research and Scientific Literature

Introduction Tobacco companies conduct and fund research. They are not always interested in open-ended research. They promote their interests through public relations campaigns. It’s a proven fact that they influence the scientific community by impairing scientific reputation, especially in the case of health-related research. Methods To obtain a comprehensive picture of research and funding activities of the tobacco industry as well as studies about the tobacco industry, respective scientific articles were analyzed in terms of temporal aspects, research areas, networking, and funding sources using established and advanced bibliometric methods. Results We found the foci of publications with tobacco industry involvement or funding were mainly in chemistry, toxicology, pharmacology, and agricultural sciences. Health-related scopes occurred much less frequently. In contrast, health and medical sciences were the main focus of publications on the tobacco industry. The Chinese state-owned CNTC was the most research-involved tobacco company and often networked with Chinese academic institutions. Whereas, Western universities, on the other hand, collaborated with tobacco companies to a much lesser extent. Conclusion Conflicts of interest of researchers or academic institutions with the tobacco industry occur repeatedly. That is highly problematic and should not be ignored by the scientific community. The science and the public should be skeptical about tobacco industry-supported research.


Introduction
As early as 1939, two surgeons and medical researchers, Alton Ochsner and Michael DeBakey, published their groundbreaking paper on the association between smoking and carcinoma of the lung, 1 confirmed in a landmark article in The Journal of the American Medical Association (JAMA) in 1950. 2 In the 1960s, the Framingham Heart Study found cigarette smoking increases the risk of heart disease. 3The US Surgeon General's 1964 report on smoking and health highlighted the health hazards of smoking and was a great media event. 4In the early 1950s, the tobacco industry started to undermine the scientific findings and evidence of the health risks of smoking by elaborate PR moves intending to impeach the credibility of science. 5The Chief Executive Officers (CEOs) of the biggest US tobacco companies and the head of a powerful PR company, John W. Hill, established 1954 the "Tobacco Industry Research Committee", later called the "Council for Tobacco Research" (CTR). 5,6Hill convinced the CEOs that it would be better to support science than to shun it and do science to sow doubt.
Their strategy aimed to amplify the skeptics of the link between smoking and diseases, among others, by funding science, creating controversies in the scientific community. 5They wanted to provide evidence to convince smokers that they have nothing to fear and to reassure the public, particularly smokers. 7After the dissolution of the two industry-wide research programs, CTR and Center for Indoor Air Research (CIAR), the research grant program "Philip Morris External Research Program" seemed to restore the scientific credibility of the tobacco industry. 8As late as 1999, tobacco companies maintained the stance that the health hazards of smoking are not proven, although some of their scientists held contrary views not made public. 9In 2020, at the beginning of the COVID-19 pandemic, news items based on preprints reported worldwide that nicotine protects against COVID-19, 10,11 meanwhile disproved.There were connections between the study group of the underlying publications and the tobacco industry. 12The tobacco industry repeatedly seeks to undermine, influence, and misuse science to its advantage at public health expense.
To what extent and in what ways has the tobacco industry influenced the research landscape, and has anything changed over time?We sought to address this question by conducting bibliometric analyses of the published scientific studies where authors were affiliated with the tobacco industry, studies funded by the tobacco industry, and studies about the tobacco industry.The presented findings of this study enable the interpretation of trends, focal points, and linkages in tobacco industry-related research and their significance for future research projects.

Methodological platform and data source
This study uses the methods of the established bibliometric platform New Quality and Quantity in Science (NewQIS). 13ewQIS provides tools for analyses of publication metadata on scientific topics.For this purpose, an internal project algorithm was created, which collects the metadata and stores it in an MS Access database.The database generated in this way is the basis for all further analyses. 13,14The standard data source for scientific literature is Clarivate's online database Web of Science (WoS), one of the largest online scientific literature databases and well established in bibliometric analyses.WoS lists publications from peer-reviewed and quality journals with their annual citation counts from 1900 to the present.

Search strategy and data processing
Three focal points were formed for the evaluation examining the scientific performance concerning the tobacco industry in more detail: search area A) = S Affiliations : publications of tobacco industry affiliated authors (at least one); search area B) = S Funder : publications funded (at least partly) by the tobacco industry; search area C) = S Title : publications about the tobacco industry.
The following search strategies were used, which combined names of all relevant tobacco companies worldwide and the associated terms that uniquely identify them into a detailed string for each focus.

Search area A) = Publications from authors affiliated
with the tobacco industry = S Affiliation : WoS Field = AFFILIATION or ADDRESS.Search string: "tobacco industr*" OR "tobacco compan*" OR "tobacco manufact*" OR "tobacco corp*" OR "tobacco factory" OR "tobacco factories" OR "cigar* industr*" OR "cigar* compan*" OR "cigar* manufact*" OR "cigar* producer*" OR " cigar* factory" OR " cigar* factories" OR "Philip Morris*" OR "British American Tob*" OR "China Tobacco*" OR "Zhengzhou Tobacco Research Institute*" OR "CNTC" OR "Imperial Brand*" OR "Imperial Tobacco*" OR "Altria*" OR "Japan Tobacco*" OR "Sampoerna tbk" OR "pt Sampoerna" OR "hm Sampoerna" OR "Swedish Match*" OR "Reynolds tobacco" OR 00 R.J. Reynolds" OR "RJ Reynolds" OR "Souza Cruz SA*" 2. Search area B) = Publications funded by the tobacco industry = S Funder : WoS Field = FUNDING AGENCY.Search string: Same as for search area A) 3. Search area C) = Publications about the tobacco industry = S Title : WoS Field = TITLE.Search string: "tobacco industr*" OR "tobacco compan*" OR "tobacco manufact*" OR "tobacco corp*" OR "tobacco factory" OR "tobacco factories" OR "cigar* industr*" OR "cigar* compan*" OR "cigar* manufact*" OR "cigar* factory" OR "cigar* factories" OR "Philip Morris" OR "British American Tobacco" OR "Imperial Tobacco" OR "Japan Tobacco" OR "Reynolds tobacco" OR 00 R.J. Reynolds" OR "RJ Reynolds" OR "R.J.Reynolds" OR "Altria" NOT "D.Altria" Each string consists of terms linked with the Boolean operator "OR" using asterisks as placeholders for the sequence of the different characters.After the search input, all entries found were filtered for original articles.No time limit was applied, so all years for each focus were included.However, this resulted in different evaluation periods since the funding agencies were systematically listed in WoS only from August 2008 onwards.
For evaluating the institutions involved, it was necessary to standardize their various designations.The companies Philip Morris International (PMI), Philip Morris Companies Inc, and Altria Group have been combined under the term Philip Morris, based in the USA (Corporate Headquarters) and Switzerland (Operations Center), for reasons of company history.The countries of origin of the founded articles have been updated with a current list of countries and regional territories.
The collected and manually standardized data was stored in an MS Access database and sorted for the three search processes (S Affiliation , S Funder , S Title ) according to the parameters to be analyzed.

Data analysis
The analyses were carried out separately for the retrieved metadata of the publications of the three search strategies (S Affiliation , S Funder , S Title ) based on the generated databases.
The data were analyzed according to chronological parameters, including annual publications, citation counts, and citation rates.The citation rates were calculated by the quotient of citations per article.Furthermore, the number of articles was related, also by calculation of the quotient, to the number of Science Citation Index Expanded (SCIE) articles to show the relative development of publication numbers.Also, the most cited articles were identified.Another focus was the analysis of the respective research areas.For this purpose, the WoS research categories were analyzed, whereby the most frequently assigned

2
Tobacco Use Insights n n categories were identified, and their proportional change was determined at 5-year intervals.The publishing institutions of the three search areas were analyzed, which required the standardization and normalization of all assigned affiliations.The so-identified most-publishing tobacco companies were also analyzed regarding the number of articles, citations, and citation rates.Cooperation networks at the institutional and national levels were analyzed.A cooperation article is defined as having at least two affiliations from different countries (national level) or authors from different institutional affiliations (institutional level).Matrices with values of cooperation were computed and transformed into vectors by a developed software module. 14he funding of research was another focus of this study.The funding organizations were identified for all three search areas.For this purpose, the sources of financing had to be standardized, the designation of the funds and the separately listed financing numbers assigned to a source organization or a company.
In addition, the publishing journals were analyzed and compared for the three search areas (S Affiliation , S Funder , S Title ).

Results
In the WoS database, beginning January 1900 until January 2022, n = 8077 articles were found where at least one tobacco industry affiliated author (S Affiliation ).These articles were cited 138 058 times in this period, meaning a citation rate cr = 17.09.The WoS category "Funding Agency" is available just since August 2008. 15From 2008 until January 2022, n = 3186 articles were found funded by the tobacco industry (S Funder ), which were cited 55 545 times in that period (cr = 17.43).From January 1900 until January 2022, n = 2204 articles about the tobacco industry (S Title ) were found, cited 23 321 times (cr = 10.58). Figure 1 shows the publication development over time of all three search areas.
Publication development over time S Affiliation .The first article we found by authors affiliated with the tobacco industry, titled 'Chemistry as an Aid to the Tobacco Industry', was published in 1922. 16The sole author was a chemist of The American Tobacco Company (British American Tobacco, BAT).By 1966, we identified only four more articles published by authors affiliated with the tobacco industry.The annual ratio of tobacco industry-funded and listed SCIE articles increased from 1.11 in 2009 to 1.58 in 2021 per 10.000 (Figure 1(D)).
S Title .The first article identified about the tobacco industry was published in 1900 in JAMA and dealt with tobacco amblyopiaa visual impairment due to tobacco -among tobacco factory employees in Cincinnati, USA. 17 The annual ratio of articles about the tobacco industry per 10.000 SCIE articles fluctuated between 0 and 0.75 (Figure 1(D)).
Table S1 in the supplementary files lists the ten most cited articles in the three analyzed search areas.Tobacco Use Insights  S Title .Among the 2204 articles about the tobacco industry, only a few were with a contribution by tobacco companies: CNTC (n = 29), PM (n = 16), BAT (n = 8), RJR (n = 2), and JTI (n = 1).

Most publishing tobacco companies
Here dominated universities from the USA, UK, and Australia.S Title .The institutional collaboration networks concerning articles about the tobacco industry (display threshold of at least three collaboration articles) showed no participation of any tobacco company (Figure 3(C)).Two collaborations were found between BAT and PM, the only collaborations of tobacco companies among themselves.Most collaborating institutions were universities from the USA and the UK, besides a Swiss association against smoking (OxyRomandie), 18 an independent non-profit research institute (RTI International, USA), 19 a nonprofit cancer charity organization (Cancer Council Victoria, Australia), 20 an independent organization against drugs (Alcohol & Drug Information Centre, Sri Lanka), 21 a network of 13 universities focused on spreading information on Tobacco and alcohol (UK Centre for Tobacco and Alcohol Studies), 22 and the American Cancer Society. 23

Most publishing countries and international collaborations
Table 3 lists the most publishing countries, and Table 4 international collaborations in the three search areas.Supplement Figure S1 in the supplementary files shows the collaborations on articles at the country level.
S Affiliation .The six most publishing countries were China, the USA, Japan, and, followed by a considerable gap, Switzerland, the UK, and Germany (Table 3A).These countries were collaborating first of all among themselves, especially the USA with Switzerland, Germany, the UK, China, or Japan, and Switzerland with Germany, to name the leading six bilateral collaborations ( S Funder .The six most publishing countries were China and the USA, followed by a bigger gap by Switzerland, the UK, Germany, and Japan (rank six in place of three) (Table 3B).The most bilateral networking occurred again between the USA and China, the UK, Germany, Switzerland, and Canada.Another identified network among the first six was between Switzerland and Germany on rank three (Table 4B, Supplement Figure S1(B)).
S Title .The most publishing country was the USA, followed by a bigger gap by the UK, Australia, China, Canada, and India, to name the leading six (Table 3C).Germany followed on rank     S Funder .Again, most of the journals listed were in the categories of chemistry, toxicology, engineering respective technology, and plant or agricultural sciences.In second place was a multidisciplinary journal, and in third was a journal in the fields of public, environmental and occupational health and substance abuse, respectively.The JIFs were all below six.S Title .A different picture emerged here.All of the journals listed belonged to the medical categories, except one in economics (rank 13) and one in business (rank 14).Moreover, three markedly high-impact journals were found with JIFs of approximately 100 and above.Another four journals had JIFs above 10.

Discussion
The tobacco industry is increasingly involved in research.Thus, policymakers, consumers, academics, and, not least, publishers should all remain cautious, given the industry's documented history of attempting to influence science for its gain at the expense of public health.Therefore, we analyzed the publication behavior and topics of the tobacco industry in scientific publications using the WoS database.We sectioned this bibliometric study into three investigation areas: (1) the investigation of publications of authors affiliated with the tobacco industry, (2) publications funded by them, and (3) publications about the tobacco industry to identify differences compared to investigation areas (1) and 2).
First, we looked at the total number of articles, their citation numbers, the resulting citation rates of each search area, and their development over time.The first identified article about the tobacco industry was published in 1900 in JAMA. 17We found only 32 articles until 1968 inclusive.This trend is similar to the development of publications of tobacco industry-affiliated authors (n = 9).Until this time, it would seem that the interest in scientific publications on the part of both the tobacco industry and the scientific community in studies about the tobacco industry was limited.We found no publications in the WoS database as a direct response to findings published in 1939, 1950, or the 1960s concerning health effects like lung cancer or heart disease [1][2][3] by authors affiliated with the tobacco industry, nor to the 1964 report of health hazards by smoking by the US Surgeon General. 25Our study confirms insofar that the tobacco industry's strategies were more likely the reputational damage of science through PR campaigns. 5The 1972 report of the US Surgeon General was the first report on the health consequences of smoking, which included the health hazards of passive smoking. 26The tobacco industry answered with scientific, public, and political disinformation campaigns and sponsored research to trivialize the health hazard of passive smoking. 27ince 1972, the relative share of publications in which tobacco industry-affiliated authors were involved increased rapidly, indicating an increase in research interest on the side of the tobacco industry.9][30][31] According to the WoS research areas, studies associated with or funded by the tobacco industry were largely unrelated to health issues.Not surprisingly, there were few studies whose authors were affiliated with or were funded by the tobacco industry and that addressed the health effects of smoking.By contrast, many articles about the tobacco industry were published in journals dealing with health topics.That was also underlined by the subject areas of the most-publishing journals.Articles by tobacco industry-affiliated authors and tobacco industry-funded articles were mainly published in journals dealing with chemistry, toxicology, or agriculture, and articles about the tobacco industry, by contrast, mainly in journals with health-related topics.Nevertheless, the funding of medical research by tobacco companies is ubiquitous, even if it is only that, eg, health-related foundations receive money from them. 32s other studies have already shown, institutional scientific collaborations have generally fanned out into broad networks. 33,34hat is also true for articles about the tobacco industry.The situation is quite different for studies in which the tobacco industry was involved, either with affiliated authors or through funding.The networks of the Chinese governmental tobacco company CNTC with many Chinese academic institutions are remarkable.Besides its research capacity, CNTC benefits from Chinese universities to further its research agenda, primarily in agriculture, production, and business management, but, increasingly, also in the so-called 'less harmful, low-tar' strategy. 35Networks of Western universities with tobacco companies could only be detected on a much lower level, as they presumably are wary of relationships with the tobacco industry due to their reputation. 35In line with these findings, for China, besides Japan, collaborations at the country level are below average.That also indicates that research involving tobacco companies (here: CNTC and JTI, respectively) is more likely to be interest-driven.Possibly, international collaborations would be more of a hindrance than a help here, also because the tobacco industry may have greater control over narratives and communities within their "hometown".CNTC is the largest tobacco company in the world. 36We have found that CNTC is also the most research-supporting tobacco company by far, both by CNTC-affiliated authors and funding.The other 'Big Tobacco', Philip Morris, British American Tobacco, Japan Tobacco, Imperial Brands, but even RJ Reynolds, follow at some distance in research support, at least as far as non-disguised funding is concerned.By its very nature, the tobacco industry is virtually uninvolved in studies about themselves.However, they have a long history of establishing third-party organizations to fund research and scientists.That leads naturally to conflicts of interest. 37It has become known that the tobacco industry uses scientists and research projects for its purposes and continues to systematically stir up controversies about the health hazards of smoking and scientific evidence. 38Notably, about one-third of publications with tobacco industry-affiliated authors received grants from the tobacco industry.Not surprisingly, articles about the tobacco industry were almost not funded by the industry.
Studies on internal tobacco industry documents revealed post hoc protocol changes and biased experimental set-ups in scientific publications linked to tobacco companies. 39,40Tobacco industry research did not meet standards for clinical research. 41Publishing tobacco industry-affiliated or funded research in scientific journals is controversially discussed. 42Several journals and academic institutions decided to stop publishing tobacco industry-supported research. 43,44Unfortunately, even leading medical journals have no tobacco policies that prohibit studies funded by the tobacco industry. 45The question arises whether rather medical journals fear to publish studies with results favorable to the tobacco industry or are non-medical journals regarding tobacco policies by far less restrictive.Future studies should analyze the publication policies of scientific journals and publishers.On the other hand, the tobacco industry publishes in non-peer-reviewed journals that suggest meeting scientific standards.Funding and disseminating non-peer-reviewed research is a longstanding strategy. 44That could also be true for medical journals and research, leading to lower entries in the WoS database as WoS does not list non-peerreviewed journals.Journals in the fields where the tobacco industry provides extraordinary support (eg, chemistry, toxicology, pharmacology, or agriculture) would do well to be skeptical, not least because the tobacco industry is interested in normalization of their presence within science and academia, even if it's not dealing with tobacco. 37The presented findings of this study enable the interpretation of trends, focal points, and linkages in tobacco industry-related research and their significance for future research projects.
All bibliometric studies have limitations depending on the used database and search strategies.The applied core collection of WoS has strict indexing requirements for journals.For example, it only contains journals that practice a standard peer-review process, so articles published in non-indexed journals are not included in the analysis.Journals that do not meet the requirements of WoS are not listed.The English bias of WoS favors English literature, so not all related publications in other languages could be included in the analysis database.WoS cannot filter out incorrect or selfcitations.That can distort figures or ratios for all citation parameters.Publications before 1900 were not included as this is the lower limit of the evaluation period of WoS.In addition, WoS began just in August 2008 to collect data systematically on funding agencies. 15Therefore, the analyses of articles funded by the tobacco industry could only be carried out from this year onward.The conclusions about the funding activity of the tobacco industry must be assessed in this context.It must also be said that not all tobacco companies could necessarily be found by the applied search strings.That is also a limitation inherent in most bibliometric analyses.To minimize this incompleteness, we included general company name affixes like, eg, tobacco industry or company with the variations of notation in addition to the names of the bigger tobacco companies.Not all authors' affiliations with the tobacco industry could be identified, as they are sometimes hidden or not declared, or the authors are affiliated with third parties with close ties to the industry.Authors' conflicts of interest with the tobacco industry are not always declared in academic publications. 46Such is true for funding activities, in particular, if funding occurred indirectly by third parties.This limitation led to a decrease in data.As the representativeness of the generated database is mandatory, a reduction in the number of entries is acceptable.

Conclusion
Tobacco companies have promoted their business interests through PR campaigns and lobbying in science and academia, including by damaging the reputation of science, conducting their "own" research, or providing specific financial support.Studies by tobacco industry-affiliated authors or sponsored by the tobacco industry are less likely to be published in health-related peer-reviewed journals but more in chemistry, toxicology, pharmacology, or agricultural sciences.The Chinese governmental CNTC is the most research-supporting tobacco company, followed by the other 'Big Tobacco' companies.Certainly, conflicts of interest occur time and again.The scientific community, researchers, academic institutions, journals, and health-related science, in particular, should be skeptical about tobacco industrysupported research.The best way to control corporate influence on science is possibly structural changes in funding science, eg, transparent and independent funding processes where payments from the industry are independently administered. 47Education programs like, eg, the Education Against Tobacco (EAT) prevention program 48 are helpful and necessary to reduce smoking prevalence and to raise awareness of the influence of the tobacco industry on science, policy, and public perception.

14
Tobacco Use Insights n n Between 1968 and 1972, n = 18 articles overall were identified.1973 was the first year with a two-digit publication number (n = 26).From then on, the number of publications per year increased more or less consistently until 2009 (n = 158 articles).From 2010 to 2021, the slope increased and reached n = 575 in 2021, the peak so far.The annual citations (c) increased abruptly from c = 9 in 1972 to c = 344 in 1973 and continued to rise subsequently to c = 5224 in 2016, with peaks in 1994 (c = 4605), 1996 (c = 5110), 2006 (c = 9031), and decreased afterward to 552 in 2021.The 23 articles published between 1900 and 1972 were cited very sparsely, except for the second and third publication from 1936 and 1937, with c = 81 and c = 28, respectively.The publications from 1966, 1968, and 1972 reached, by contrast, only cr = 4, 0.5, and 1.8, respectively.From 1973 onwards, the citation rate increased from 13.23 to 51.9 in

Figure 1 .
Figure 1.Publication development over time with the number of articles, number of citations, and citation rate.Only completed years are included.A: Articles from authors affiliated with the tobacco industry from 1900 to 2021.B: Articles funded by the tobacco industry from 2009 to 2021.C: Articles about the tobacco industry from 1900 to 2021.D: Relative number of articles (search areas S Affiliation , S Funder , S Title ) per 10 000 articles listed in the Science Citation Index Expanded (SCIE) database of Web of Science.TI = Tobacco industry.

3
Braun et al n n 2006, with peaks in 1977 (cr = 20.71),1994 (cr = 48.47),and 1996 (cr = 40.88),and decreased then to 1.04 in 2021 (Figure 1(A)).The annual ratio of articles from authors affiliated with the tobacco industry and all SCIE articles jumped between 1972 and 1976 from far below 1 to 1.32 articles per 10 000 SCIE articles and again in 2013 to 1.75 and further increased to 2.2 in 2021 (Figure 1(D)).

S
Funder .From 2009 to 2021, the number of articles funded by the tobacco industry increased relatively consistently from n = 166 to n = 413 per year, with a slightly steeper rise since 2018.The number of citations decreased steadily from c = 7694 in 2009 to c = 374 in 2021.The citation rate decreased likewise from cr = 46.35 in 2009 to cr = 0.97 in 2021 (Figure 1(B)).
Through 1968, n = 32 more articles were published, with a maximum of three articles per year(1965 and 1967).1969 was the first year with two-digit publication number (n = 11), followed by 1974 with n = 10, and 1981 with n = 23 publications per year.From then on, the number of articles per year remained consistent between n = 9 and n = 28 until 1994.From 1995 until 2021, the number increased slowly from n = 44 to n = 72, with little peaks in 2006 (n = 81), 2018 (n = 137), 2019 (n = 97), and 2020 (n = 94).The 33 articles published between 1900 and 1968 were only ten times cited overall.1969 was the first year with a two-digit number of citations (n = 20), followed by 1972 (n = 11) and 1973 (n = 12).1981 showed the first peak with n = 133 citations, also 1985 (n = 138) and 1991 (n = 127).From 1993, the number of citations rose from 114 to the highest, 2237 in 2002, followed by four-digit numbers between c = 1208 and c = 1700 from 2003 to 2006 and 2008.Afterward, the number of citations decreased to 42 in 2021.The citation rate followed approximately the run of the citation curve, with the highest peak also in 2002 (cr = 33.39)(Figure 1(C)).

Figure 2
Figure 2 shows the evolution of the ten most assigned WoS research areas in 5-year intervals from 1973 to 2022 (S Affiliation and S Title ), respectively 2008 to 2022 (S Funder ).Table 1 lists the 15 most assigned WoS research areas of the three search areas

Figure 2 .
Figure 2. Relative share of the ten most assigned Web of Science (WoS) research areas in 5-year intervals sorted by affinity.A: Articles from authors affiliated with the tobacco industry from 1973 to 2022.B: Articles funded by the tobacco industry from 2008 to 2022.C: Articles about the tobacco industry from 1973 to 2022.

Figure 3
Figure3illustrates the collaboration networks of the respective tobacco companies and institutions in the three search areas.

Figure 3 .
Figure 3. Collaboration networks of the tobacco companies and institutions.Numbers: number of common articles/number of citations.A: Publications from authors affiliated with the tobacco industry.Threshold for display: 30 collaboration articles.B: Publications funded by the tobacco industry.Threshold for display: 10 collaboration articles.C: Publications about the tobacco industry.Threshold for display: 3 collaboration articles.
respective journal category (subject area) and the Journal Impact Factors (JIFs) from the database of the Journal Citation ReportsÔ from Clarivate (accessed on 23 February 2023).S Affiliation .Of the 15 most publishing journals, the first 14 were widely in the fields of biosciences, chemistry, toxicology, engineering, and plant or agricultural sciences.A multidisciplinary journal ranked 15.Disciplines of medicine were not listed, except legal medicine in one case.The JIFs were all below seven, and the top two journals were not indexed in the Journal Citation ReportsÔ database.Of note, the 12 th -ranked German Journal, Contributions to Tobacco Research International (original German title: Beiträge zur Tabakforschung, currently: Contributions to Tobacco & Nicotine Research) was originally published by the German Association of Cigarette Industries (German: VdC, Verband der Cigarettenindustrie).24

Table 1 .
Fifteen most assigned Web of Science (WoS) research areas sorted by number of articles of the three search areas (S Affiliation , S Funder , S Title ) analyzed with stated percentage of the total number of articles.The 3186 articles funded by the tobacco industry were 4605 times listed in 111 WoS research areas.The ranking of the ten most assigned WoS research areas was similar to that of search area SAffiliation.It differed that in place of Genetics & Heredity, Food Science & Technology, and Materials Science, the WoS research areas Microbiology, Environmental Sciences & Ecology, and Science & Technology -Other Topics were among the first ten (Figure 2(B)).Here also Chemistry had the highest share of all listed research areas, and, likewise, research areas from the health or medical sciences played a more of a minor part.Public, Environmental & Occupational Health was the first listed in this area with a share of under 2% (rank 16 of 111) (Supplement Table.S2B).
S Title .The 2204 articles about the tobacco industry were 3162 times listed in 96 WoS research areas.Among the ten most assigned WoS research areas, compared to the search areas SAffiliation and SFunder, only Engineering was also listed here (Figure 2(C)).Four research areas belonged to health or medical sciences, Public, Environmental & Occupational Health (rank 1), General & Internal Medicine (rank 3), Health Care Sciences (rank 8), and Oncology (rank 10) representing 44.5% of all listed articles (Tab.S2C).

Table 2
shows the most publishing tobacco companies and institutions concerning the three search areas sorted by the number of articles.In the table, the thresholds for institutions were set at 50 articles for search areas S Affiliation and S Funder and at 20 articles for S Title .All tobacco companies with at least one article were listed.

Table 2 .
Most publishing tobacco companies and institutions in the three search areas (S Affiliation , S Funder , S Title ) measured by the number of articles.CNTC = China National Tobacco Corporation.JTI = Japan Tobacco Inc. PM = Philip Morris.RJR = R. J. Reynolds Tobacco Company.BAT = British American Tobacco.

Table 3 .
Most publishing countries (threshold 30 articles at search areas S Affiliation and S Funder , 10 articles at search area S Title sorted by the total number of articles with the declaration of the share of collaboration articles.Switzerland nine, and Japan on rank 12.Most collaborations occurred between the USA and the UK, Canada, Australia, and China, and, additionally, between the UK and Canada and Australia, respectively (Table4C, FigureS1(C)).

Table 5
lists the 15 most publishing journals sorted by the number of articles in the three analyzed search areas, including

Table 4 .
Bilateral collaborations at country level sorted by the number of collaboration articles in the three search areas S Affiliation (threshold 20 articles), S Funder (threshold 15 articles), and S Title (threshold 5 articles).

Table 5 .
The 15 most publishing journals sorted by the number of articles of the three search areas (S